Adjustable generator



C. M. SNADER ADJUSTABLE GENERATOR Dec. 14, 1948.

Filed Aug. 8, 1945 2 Sheets-Sheet 1 Patented Dec. 14. 1948 UNITED STATES PATENT OFFICE ADJUSTABLE GENERATOR Crai'ge M. Snader, Rosedale, Pa. Application August 8, 1945, SerialNo. 609,671

paterns at predetermined amplitude and phase.

One of theobjects of my inventionis to provide a simplified constructionof multiple wave generator having means for accuratelycontrolling the 'phaseand amplitude of thegenerated wave.

Another object of .my .inventionis to provide :an :improved construction of mechanical-device for usein-the generation of electric waveenergy in which the amplitude and phase of the generated energy maybe readily shifted from one conditlon to'another.

A further object .of my invention is to provide a construction of adjustable-gear means which may be micrometrically adjusted .to produce a highly precise wave form of predetermined characteristic.

Still another objectof my invention is to provide a selective mechanism .forelectric generators for precisely determining thecharacteristics of electric waves including conditions of frequency, amplitude and phase.

Other and further-objects .of my invention reside in theconstruction ofamultiple .wave generator as set forth more fully-in thespecification hereinafter following byre'ference to the accompanying drawingsin which:

Figure '1 is a plan vi-ewof .the multiple wave generator of my invention showing the micrometric adjustment means associated therewith for controlling the-characteristicsof the output .or wave form delivered by the multiple wave generator; Fig. 2 is asideelevational view of the multiple wave generator shown in Fig.1; Fig. 3 is an end view of themultiple wave generator; Fig. 14 is a side elevational view of the multiple wave generator showing the coil support removed to illustrate the twocoilsemployed in .the circuit of the multiple frequencyv generator of my invention; Fig. 5 diagrammatically illustrates oneapplication .of the multiplezfrequency generator of my invention, and Fig. .6 diagrammatically. illustrates a modified circuitaembodying the multiple frequency generator ofmyinvention in which the control windings 'aretregeneratively coupled through the adjustable and angularly movable magnetic core structure.

The generator df-my inventionprovidesmeans whereby electric currents of predeterminedfrequency may be generated, combined-and regulated so as to-provide resultant currents :having "erator "by which the frequency, amplitude or phase or any or all of these features of:the gen- :erated current maybe varied at Will to provide a resultant wave shape or characteristic curve produced by combining two or moresuch currents which is'of predetermined pattern.

The .mechanismby which the objects of my in- .vention are carried out are set forth in the ac- .companying drawings in which a magnetic rotor .or discR is provided withaperipheral contourof such 'shapeas will'produce Wave forms of predetermined characteristic. If a sine Waveis to be produced the circumference of the discis edged with small sine Wave shapes. A saW-toothgen- .erator curve characteristic is produced byedging the "circumference of the disc with a saw-tooth pattern. The electric waves which are generated by :the mechanism of:my.invention may be converted into sine waves or waves of other predetermined pattern by combining such waves with a predetermined Wave pattern produced by another generator of the type embodying my invention. The rotor R having the predetermined pattern on the periphery thereof is driven by mo- :tor M controlled from suitable motor controller D interposed in circuit with-the source of power supply. The rotor R has the periphery thereof driven in direct alignment and in front of the magnetized core C of the solenoid system S, cur-, rent being induced in such solenoid system inthe circuit A indicated in Fig. 2. The frequency of the generated current is the product of the rotor speed andthe number of Wave shapes R on the periphery of the rotor R. The frequency can be changed by changing the speed of rotor R by adjusting motor controller D.

The magnetized core C is axially rotatable under control of micrometer mechanism I I by which the'magnetized core '0 may be advanced or retracted toward or away from the periphery of rotor R for changing the air gap between the end of the magnetized core'C and the wave forms R on the periphery of rotorR. The magnetized core C is provided with a screw threaded portion i! which engages-internal screw threads [8 in thebore of the transverse projection 19 on the plate member 20. The plate member 26 includes an end portion '2! in the form of a transversely extending-sleeve or hub whichis angularly adjustable on a cylindrical projection 22 formed on the standard "23 extending vertically from the base .of the unit 'representedat .24. The standard 23 thus serves as a swivel support about which .plate member ZOmaybe angularly adjusted and also'has a journalling means for the shaft 325 which extends from motor M to rotor R. The plate '20 is provided at the end opposite the afore- -mentioned pivoted end with a segmental gear [3.

The-segmental gear It includes transversely exdownwardly about the sleeve 22 as a center pivot. The worm gear I 4 is carried by a vertical shaft 26 which is journalled in the lower end 21 adjacent the base 24 and the upper end 28 in bracket member 29. The upper end of shaft 26 projects through the bracket 29 and is engaged by the rotatable calibrated head 16. The rotatable calibrated head l6 may be gripped by a tool or manually by the fingers and revolved with respect to the indicator point 39. When revolved in one direction worm Hi coacts with the teeth of segmental gear iii to angularly shift plate member so in an upward direction while when the head i is revolved in the opposite direction, worm I4 is turned to correspondingly engage the gear teeth of the segment I3 to shift plate member 20 in an angularly downward direction. This adjustment has the effect of angularly shifting the end of the magnetized core C with respect to the peripheral outline R of the rotor R for precisely controlling the phase of the generated current.

The solenoid windings which coact with the adjustable magnetized core C are mounted on the plate 23. In Figs. 1, 2 and 3 I have shown a single electromagnetic winding S carried by the bobbin or coil support 3| with the ends of the winding extending through the cable represented at A. Suitable means of attachment, such as bracket 32, are provided for mounting solenoid S on plate member 23 intermediate the pivotal end thereof represented at 33 and the segmental gear end thereof represented at I3. The solenoid S has an axial passage extending therethrough to permit magnetized core 0 to be advanced or retracted with respect to the solenoid winding S under control of the micrometer screw ll operating in the internal screw threads l8 of the transversely extending projection 19 of plate 20. The magnetized core C is controlled in longitudinal movement by the coaction of the calibrated cylindrical extension ii on projection l9 and the coacting calibrated micrometer adjusting head it. The combination of micrometer threads enables extremely minute movements to be imparted to the magnetized core C for selecting the air gap between the end of magnetized core C and the periphery of the rotor R with extreme precision. Thus the amplitude of the current generated in the winding of solenoid S can be changed by changing the air gap between the periphery of the rotor R and. the end of the magnetized core C.

The combination movement thus provided by longitudinal adjustment of the magnetized core C and the angular adjustment of the magnetized core C with respect to the periphery of the shaped contour R of the rotor R enables precise control of the current generated in solenoid winding S. To decrease the amplitude the gap between the end of magnetized core C and the periphery R of rotor R is increased and to change the phase of the current in solenoid winding S the plate 20 is angularly shifted with sleeve 22 as a center.

The utilization circuit which is connected with solenoid winding S may have a variety of applications wherever current of precise amplitude and phase is required.

In Fig. 4 I have illustrated a modified form of the structure of my invention in which the magnetic micrometer movement is associated with an electrical device consisting of a solenoid winding B adjacent the solenoid winding A. In this arrangement the solenoid winding A is wound upon a coil form 34 while solenoid winding B is wound upon an immediately adjacent coil form 35. The solenoid winding B may be connected in the regenerative regulator circuit or in an exciter circuit by which the initial magnetic fiux in the core C may be regulated. The separate solenoid windings A and B which are associated with the same magnetized core C may be connected to separate electron tube circuits which are thus magnetically coupled through the adjustable magnetized core C as shown for example, in Fig. 5.

In the arrangement illustrated in Fig. 5 the solenoid winding A connects to the input circuit of an electron tube amplifier designated generally at 36, the output circuit of which, represented at 31, is coupled to a mixing circuit represented at 38. The adjacent solenoid winding B is connected to the input circuit of electron tube amplifier 39, the output circuit of which is represented at 40 coupled to the mixing circuit 38. Both the input and output circuits of the electron tube amplifier systems 36 and 39 are tuned so that the relatively feeble currents that are generated in the solenoid windings A and B may be built up to substantial amplitude at frequencies f2 and f3 by reason of the several tuned circuits. The currents generated in solenoid windings A and B and delivered to mixing circuit 38 are controlled as to amplitude by the spatial relation of the end of magnetized core C with respect to the periphery R of rotor R. These currents are controlled as to frequency by the speed of rotation of rotor R and as to phase by the angular position of magnetized core C with respect to the periphery R of rotor B. By combining the outputs of the amplifier systems 36 and 33 in the mixing circuit 38 a resultant frequency i4 is obtained which is of predetermined frequency, phase and amplitude. Any one of these factors may be selectively changed at will by use of the magnetically adjustable system of my invention. To facilitate the comparison of this predetermined frequency, phase and amplitude current with an unknown source having comparable characteristics and which I have designated as f1 the unknown source is picked up through the circuit designated at 4! and led through amplifier system 42 to the tuned circuit G3. The outputs of circuits 38 and 43 may then be selectively impressed upon the coupling system 44 leading to the detector system 45 by operation of either switch 46 or 41. The detector 45 connects to the amplifier 48, the output of which connects to the cathode ray oscilloscope 49. Thus the wave trace of the energy delivered by the electric generator of my invention of the frequency f4 may be observed when switch 46 is closed and switch 4'! is open. Upon opening switch 46 and closing switch 41 the characteristics of the source of unknown frequency f1 may be observed. Upon closing both switches 46 and 41 the characteristics of both the locally generated frequency f4 and the unknown frequency f1 may be observed, studied and analyzed. In order to determine the characteristics of the unknown frequency ii, the current delivered by the local generator may be adjusted according to the calibrations on motor controller D at 50 as to motor speed; according to calibrations l6 as to phase; and according to calibrations 5| of micrometer H according to amplitude so that there may be reproduced on the screen of the oscilloscope a wave trace represented at 52 which substantially corresponds with the wave trace of the unknown source represented at 53 for thus reproducing and determining the characteristics of the unknown source.

As hereinafter stated the solenoid winding B may be regeneratively coupled through an electron tube system and through the magnetized core C with the solenoid winding A or solenoid winding B may be energized from a potential source 54 controlled through an adjustable rheostat 55 for establishing the initial magnetic flux in the magnetic core C as represented in Fig. 6. Thus a further precision control feature is added to the system of my invention by selectively controlling the magnetic saturation of the magnetized core C.

While I have described my invention in certain of its preferred embodiments and have mentioned certain applications thereof, I realize that structural changes may be made in the mechanism of my invention and that my invention may be applied to numerous applications. Accordingly, I intend no limitations or restrictions upon my invention other than may be imposed by the scope of the appended claims.

What I claim and desire to secure by Letters Patent of the United States is as follows:

1. In a multiple Wave generator a supporting structure, a driving shaft journaled with respect to said supporting structure, a magnetic rotor driven by said shaftv a b acket mounted on supporting structure and spaced from said driving shaft, a plate memberjournalled at one end about said shaft and projecting into said bracket at the other end thereof, adjustable gear means associated with the last mentioned end of said plate member, an electromagnetic solenoid system a bracket for mounting said electromagnetic solenoid system on said plate member, a magnetized core member adjustable through said solenoid system toward or away from the periphery of said magnetic rotor, an electrical circuit connected with said solenoid system, and means associated with said gear system for variably adjusting the spatial relation of said magnetized core member with respect to the periphery of said rotor and selectively fixing the radial position of said magnetized core member with respect to the periphery of said rotor for controlling the characteristics of current generated in said solenoid system and supplied to said electric circuit.

2. In a multiple wave generator comprising, in combination with a variable speed driving motor, a supporting structure, a driven shaft journaled with respect to said supporting structure and operated by said motor, a bracket mounted on said supporting structure and spaced from said driving shaft, a rotor of magnetic material carried by said shaft and having a pro-formed periphery shaped to produce pre-determined characteristics in the generation of electric current, an angularly adjustable member angularly shiftable about said driven shaft as a center and extending through said bracket, an electromagnetic winding carried by said angularly adjustable member, a magnetized core longitudinally adjustable through said electromagnetic winding toward or away from the periphery of said rotor, and screw devices disposed adjacent said bracket for adjusting both the radial position of said magnetized core and the spatial relation of the end of the magnetized core with respect to the periphery of said rotor.

3. In a multiple wave generator, a supporting structure, a magnetic inductor, a shaft journaled with respect to said supporting structure for rotatively driving said inductor, a variable speed motor for driving said shaft, a bracket mounted on said supporting structure and spaced from said driving shaft, a solenoid system, a magnetized core adjustable through said solenoid system toward and away from the periphery of said rotor, and adjustable means disposed adjacent said bracket for controlling the air-gap between the end of said magnetized core and periphery of said rotor and controlling the radial position of said magnetized core with respect to the periphery of said rotor, and separate means for controlling the speed of said motor whereby said solenoid system effectively supplies electrical current, controllable as to phase, amplitude, and frequency.

4. In a multiple wave generator a supporting structure, a variable speed motor, a shaft driven by said motor, means for journalling said shaft with respect to said supporting structure, a hublike projection on said means, a magnetic inductor carried by said shaft in a position beyond said hub-like projection, a bracket mounted on said supporting structure and spaced from said driving shaft, a plate member having one end thereof journalled on said hub-like member and having the other end thereof projecting through said bracket an adjustable screw means supported by said bracket andengaging the last mentioned end of said plate member for angularly shifting said plate member about said hublike member as a center, a solenoid system carried by said plate member, a magnetized core extending through said solenoid system, directed toward the periphery of said magnetic inductor, and screw means disposed adjacent said bracket for advancing or retracting said magnetized core.

5. In a multiple wave generator a supporting structure, a variable speed motor, a shaft driven by said motor, means for journalling said shaft with respect to said supporting structure, a hublike projection on said means, a magnetic inductor carried by said shaft in a position beyond said hub-like projection, a bracket mounted on said supporting structure and spaced from said driving shaft, a plate member having one end thereof journalled on said hub-like member and having the other end thereof projecting through said bracket, an adjustable screw means supported by said bracket and engaging the last mentioned end of said plate member for angularly shifting said plate member about said hublike member as a center, a solenoid system carried by said plate member, a magnetized core extending through said solenoid system, directed toward the periphery of said magnetic inductor, screw means disposed adjacent said bracket for advancing or retracting said magnetized core, and calibrated means for selectively determining the air-gap between the end of said magnetized core and the periphery of said rotor, and the radial position thereof with respect to the periphery of said rotor.

CRAIGE M. SNADER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,986,531 Robb Jan. 1, 1935 2,278,179 Lauder Mar. 31, 1942 

